vnconfig.8: Mention comment lines in the configuration file.
[dragonfly.git] / games / number / number.c
1 /*-
2  * Copyright (c) 1988, 1993, 1994
3  *      The Regents of the University of California.  All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 3. Neither the name of the University nor the names of its contributors
14  *    may be used to endorse or promote products derived from this software
15  *    without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  *
29  * @(#) Copyright (c) 1988, 1993, 1994 The Regents of the University of California.  All rights reserved.
30  * @(#)number.c 8.3 (Berkeley) 5/4/95
31  * $FreeBSD: src/games/number/number.c,v 1.12 1999/12/12 03:22:35 billf Exp $
32  */
33
34 #include <sys/types.h>
35
36 #include <ctype.h>
37 #include <err.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include <unistd.h>
42
43 #define MAXNUM          65              /* Biggest number we handle. */
44
45 static const char       *name1[] = {
46         "",             "one",          "two",          "three",
47         "four",         "five",         "six",          "seven",
48         "eight",        "nine",         "ten",          "eleven",
49         "twelve",       "thirteen",     "fourteen",     "fifteen",
50         "sixteen",      "seventeen",    "eighteen",     "nineteen",
51 },
52                 *name2[] = {
53         "",             "ten",          "twenty",       "thirty",
54         "forty",        "fifty",        "sixty",        "seventy",
55         "eighty",       "ninety",
56 },
57                 *name3[] = {
58         "hundred",      "thousand",     "million",      "billion",
59         "trillion",     "quadrillion",  "quintillion",  "sextillion",
60         "septillion",   "octillion",    "nonillion",    "decillion",
61         "undecillion",  "duodecillion", "tredecillion", "quattuordecillion",
62         "quindecillion",                "sexdecillion",
63         "septendecillion",              "octodecillion",
64         "novemdecillion",               "vigintillion",
65 };
66
67 static void     convert(char *);
68 static int      number(char *, int);
69 static void     pfract(int);
70 static int      unit(int, char *);
71 static void     usage(void) __dead2;
72
73 static int lflag;
74
75 int
76 main(int argc, char **argv)
77 {
78         int ch, first;
79         char line[256];
80
81         lflag = 0;
82         while ((ch = getopt(argc, argv, "l")) != -1)
83                 switch (ch) {
84                 case 'l':
85                         lflag = 1;
86                         break;
87                 case '?':
88                 default:
89                         usage();
90                 }
91         argc -= optind;
92         argv += optind;
93
94         if (*argv == NULL)
95                 for (first = 1;
96                     fgets(line, sizeof(line), stdin) != NULL; first = 0) {
97                         if (strchr(line, '\n') == NULL)
98                                 errx(1, "line too long.");
99                         if (!first)
100                                 printf("...\n");
101                         convert(line);
102                 }
103         else
104                 for (first = 1; *argv != NULL; first = 0, ++argv) {
105                         if (!first)
106                                 printf("...\n");
107                         convert(*argv);
108                 }
109         exit(0);
110 }
111
112 static void
113 convert(char *line)
114 {
115         int flen, len, rval;
116         char *p, *fraction;
117
118         flen = 0;
119         fraction = NULL;
120         for (p = line; *p != '\0' && *p != '\n'; ++p) {
121                 if (isblank(*p)) {
122                         if (p == line) {
123                                 ++line;
124                                 continue;
125                         }
126                         goto badnum;
127                 }
128                 if (isdigit(*p))
129                         continue;
130                 switch (*p) {
131                 case '.':
132                         if (fraction != NULL)
133                                 goto badnum;
134                         fraction = p + 1;
135                         *p = '\0';
136                         break;
137                 case '-':
138                         if (p == line)
139                                 break;
140                         /* FALLTHROUGH */
141                 default:
142 badnum:                 errx(1, "illegal number: %s", line);
143                         break;
144                 }
145         }
146         *p = '\0';
147
148         if ((len = strlen(line)) > MAXNUM ||
149             (fraction != NULL && ((flen = strlen(fraction)) > MAXNUM)))
150                 errx(1, "number too large, max %d digits.", MAXNUM);
151
152         if (*line == '-') {
153                 printf("minus%s", lflag ? " " : "\n");
154                 ++line;
155                 --len;
156         }
157
158         rval = len > 0 ? unit(len, line) : 0;
159         if (fraction != NULL && flen != 0)
160                 for (p = fraction; *p != '\0'; ++p)
161                         if (*p != '0') {
162                                 if (rval)
163                                         printf("%sand%s",
164                                             lflag ? " " : "",
165                                             lflag ? " " : "\n");
166                                 if (unit(flen, fraction)) {
167                                         if (lflag)
168                                                 printf(" ");
169                                         pfract(flen);
170                                         rval = 1;
171                                 }
172                                 break;
173                         }
174         if (!rval)
175                 printf("zero%s", lflag ? "" : ".\n");
176         if (lflag)
177                 printf("\n");
178 }
179
180 static int
181 unit(int len, char *p)
182 {
183         int off, rval;
184
185         rval = 0;
186         if (len > 3) {
187                 if (len % 3) {
188                         off = len % 3;
189                         len -= off;
190                         if (number(p, off)) {
191                                 rval = 1;
192                                 printf(" %s%s",
193                                     name3[len / 3], lflag ? " " : ".\n");
194                         }
195                         p += off;
196                 }
197                 for (; len > 3; p += 3) {
198                         len -= 3;
199                         if (number(p, 3)) {
200                                 rval = 1;
201                                 printf(" %s%s",
202                                     name3[len / 3], lflag ? " " : ".\n");
203                         }
204                 }
205         }
206         if (number(p, len)) {
207                 if (!lflag)
208                         printf(".\n");
209                 rval = 1;
210         }
211         return (rval);
212 }
213
214 static int
215 number(char *p, int len)
216 {
217         int val, rval;
218
219         rval = 0;
220         switch (len) {
221         case 3:
222                 if (*p != '0') {
223                         rval = 1;
224                         printf("%s hundred", name1[*p - '0']);
225                 }
226                 ++p;
227                 /* FALLTHROUGH */
228         case 2:
229                 val = (p[1] - '0') + (p[0] - '0') * 10;
230                 if (val) {
231                         if (rval)
232                                 printf(" ");
233                         if (val < 20)
234                                 printf("%s", name1[val]);
235                         else {
236                                 printf("%s", name2[val / 10]);
237                                 if (val % 10)
238                                         printf("-%s", name1[val % 10]);
239                         }
240                         rval = 1;
241                 }
242                 break;
243         case 1:
244                 if (*p != '0') {
245                         rval = 1;
246                         printf("%s", name1[*p - '0']);
247                 }
248         }
249         return (rval);
250 }
251
252 static void
253 pfract(int len)
254 {
255         static const char *pref[] = { "", "ten-", "hundred-" };
256
257         switch(len) {
258         case 1:
259                 printf("tenths.\n");
260                 break;
261         case 2:
262                 printf("hundredths.\n");
263                 break;
264         default:
265                 printf("%s%sths.\n", pref[len % 3], name3[len / 3]);
266                 break;
267         }
268 }
269
270 static void
271 usage(void)
272 {
273         fprintf(stderr, "usage: number [# ...]\n");
274         exit(1);
275 }